An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

On a wall in Cleveland, Ohio find the story of a highly connected fictional community of organisms that created remarkable, lasting structures.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

Mutant vegetables, transgenic mosquitos, and atomic rodents span the walls of this one-of-a-kind museum.

Pennsylvania's own Roswell-style UFO mystery.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Home to items never before seen by the public.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

A museum dedicated to exhibiting remarkable outsider art.

A priceless collection of the Nation's cryptologic history.

This woodland architectural installation acts as a camera obscura for the heavens.

Art museum based around the collections accumulated over 58 years by one eccentric thrift store owner.

An abandoned village that doubled as "The Hunger Games"' post-apocalyptic wasteland is up for grabs.

Mystery surrounds a famous marshal of Napoleon's army.

The world's longest known cave system.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

A visionary precursor to the Internet made of index cards.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Home of Philip Johnson, one of the 20th century's most influential architects.